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  1. #11
    Ah so! Thanks for clearing this up.

    So I will bore out a blank R8 to fit a parrallel shank ER20 holder. Fit a drive pin and spring to bias the holder at 50% of the slot. Then use the square ER20 tapping collets.

    Seems like a plan

  2. Sounds like a plan!
    Ensure your materials are hard enough and well lubricated enough to avoid galling, making the pin square with soft corners and using a Moly lube on the sliding areas will help,
    You think that's too expensive? You're not a Model Engineer are you? :D

  3. Floating tap holders, aka Tension/Compression Tap Holders are the perfect solution when you need to tap a hole. Bridging the synchronization gap between toolhodler and Z-axis feed, the spring mechanism compensates for the minute acceleration.

    Factory Automation

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